A permanent magnet magnetizing device, a preparation method and application thereof

Abstract

The application belongs to the technical field of permanent magnet preparation, and particularly relates to a permanent magnet magnetizing device, a preparation method and application thereof. The permanent magnet magnetizing device comprises at least one magnetizing track, the magnetizing track is in a circular arc shape, the magnetizing track is arranged by a plurality of magnetic steels, the magnetic poles of the magnetic steels are different, the magnetic steels are permanent magnets, and the residual magnetism of the magnetic steels is greater than or equal to 1T. The permanent magnet magnetizing device has a simple structure, can provide a magnetizing magnetic field with uniform and consistent magnetic pole strength, and can obtain a permanent magnet with good consistency when magnetizing. The NS magnetic pole zero magnetic area of the permanent magnet is less than or equal to 0.5mm, the pole width is N less than or equal to 3mm, and the permanent magnet with different magnetic pole widths or a magnetic pole number greater than or equal to 1 on one orientation pole surface can also be obtained.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet preparation technology, and particularly relates to a permanent magnet magnetizing device, its preparation method and application. Background Technology

[0002] Currently, magnetizing magnetic materials typically involves using coils and pulsed magnetic fields. This means that a high voltage and high current from a magnetizing power supply are used to instantaneously pulse and discharge onto the solenoid. However, the coil winding and yoke manufacturing processes are complex and costly. Furthermore, the charging process is slow and inefficient, generates significant heat, and if not cooled in time, there is a risk of coil explosion. Additionally, the resulting magnetic field shape and strength have poor consistency, making it unsuitable for magnetizing magnetic materials with extremely narrow widths and high consistency requirements.

[0003] Patent application number 201910295919.0 discloses a permanent magnet multi-pole magnetizer, which uses a multi-pole magnetic circuit design to arrange magnets as a magnetic source, establishing a multi-pole permanent magnetic field to magnetize the magnet to be magnetized. This magnetizer does not require a magnetizing coil or pulse power supply, which is completely different from traditional coil-type magnetizing clamps. However, this magnetizer requires a magnetic yoke with a large pole width, making it unsuitable for magnets with narrow poles, and it has a large zero-magnetic zone, making it only suitable for magnets with planar poles. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a permanent magnet magnetizing device, its preparation method, and its application, which can effectively magnetize extremely wide magnetic rings with multiple tracks less than 1 mm and obtain permanent magnets with high consistency.

[0005] In a first aspect, the present invention provides a permanent magnet magnetizing device, comprising at least one magnetizing track, the magnetizing track being arc-shaped, the magnetizing track being composed of a plurality of magnets arranged in different directions, and the magnets being permanent magnets.

[0006] In this invention, the arc shape refers to an arc with a certain width. The width of the arc is not particularly limited and is determined by the width of the magnet.

[0007] According to an embodiment of the present invention, adjacent magnets may or may not be in contact, for example, they may not be in contact.

[0008] According to an embodiment of the present invention, the magnet has a rectangular structure or an arc-shaped structure, for example, a rectangular structure.

[0009] According to an embodiment of the present invention, the remanence of the magnet is ≥1T, preferably ≥1.3T, and more preferably ≥1.5T.

[0010] According to an embodiment of the present invention, the magnet is selected from at least one of ferrite permanent magnet, sintered NdFeB permanent magnet, and samarium cobalt permanent magnet, for example, sintered NdFeB permanent magnet.

[0011] According to an embodiment of the present invention, the magnetizing device includes at least two arc-shaped magnetizing tracks, and the different arc-shaped magnetizing tracks are arranged concentrically or non-concentrically.

[0012] According to an embodiment of the present invention, different arc-shaped magnetized tracks are stacked one on top of the other.

[0013] According to an embodiment of the present invention, the angle of the arc is not particularly limited and can be any value in the range of 15 to 360°. Preferably, the angle of the arc is 30 to 360°, for example, 20 to 50°, 30 to 60°, 50 to 100°, 60 to 120°, 80 to 160°, 90 to 180°, 100 to 240°, 120 to 260°, 120 to 300°, or 180 to 360°.

[0014] As an example, the magnetization device includes two circular magnetization tracks, which are arranged concentrically. The distance between the two circular magnetization tracks is set according to actual needs and is not particularly limited.

[0015] As an example, the magnetization device includes a circular magnetization track and an arc-shaped magnetization track. Preferably, the arc-shaped magnetization track is located inside or outside the circular magnetization track. More preferably, the circular magnetization track and the arc-shaped magnetization track are concentrically arranged.

[0016] As an example, the magnetization device includes two arc-shaped magnetization tracks, preferably one of which is positioned on top of the other.

[0017] According to an embodiment of the present invention, the magnets on the same magnetized track may have the same or different heights, for example, the same height.

[0018] According to an embodiment of the present invention, the heights of the magnets on different magnetized tracks may be the same or different, for example, the same.

[0019] According to an embodiment of the present invention, the permanent magnet magnetizing device further includes a positioning device, which includes a base and a positioning mechanism. The magnetizing track and the positioning mechanism are disposed on the base, and the positioning mechanism is used to provide a position (area) for fixing the magnet to be magnetized.

[0020] According to an embodiment of the present invention, the connection between the magnet on the magnetized track and the base is a fixed connection or a detachable connection, such as an adhesive connection.

[0021] According to an embodiment of the present invention, at least one of the magnetizing tracks surrounds the area on the positioning mechanism where the element to be magnetized is placed. For example, one magnetizing track surrounds the positioning device inside, or one magnetizing track surrounds the outside of the area where the element to be magnetized is placed.

[0022] According to an embodiment of the present invention, the positioning device is made of a magnetic material or a non-magnetic material.

[0023] According to an embodiment of the present invention, the structure of the positioning mechanism is determined according to the structure of the magnetic component to be charged, which is, for example, an annular, rectangular, or arc-shaped component.

[0024] As an example, when the magnet to be charged is an annular shape, the positioning mechanism includes a support platform for supporting the annular shape. Preferably, the support platform is further provided with a guide rod for providing a channel through which the annular shape passes.

[0025] As an example, when the component to be magnetized is arc-shaped, the positioning mechanism includes a positioning platform, and a positioning groove is provided on the side of the positioning platform opposite to the magnetization track. The positioning groove is used to accommodate the component to be magnetized.

[0026] Secondly, the present invention provides a method for preparing the above-mentioned permanent magnet magnetizing device, comprising the following steps:

[0027] After the magnet is magnetized, it is fixed on the positioning device to form a magnetized track.

[0028] According to an embodiment of the present invention, magnetizing the magnet includes the following steps: magnetizing a high remanence sintered NdFeB magnet until the remanence exceeds 1.3T.

[0029] According to an embodiment of the present invention, fixing the magnetized magnet onto the positioning device after magnetization includes the following steps: attaching the magnetized magnet to the positioning device with an adhesive, for example, by using glue.

[0030] Thirdly, the present invention also provides an application of a permanent magnet magnetizing device in magnetization.

[0031] Fourthly, the present invention also provides a method for magnetizing a permanent magnet magnetizing device, comprising the following steps: placing the part to be magnetized on a positioning device until magnetization is completed, thereby obtaining a permanent magnet.

[0032] According to an embodiment of the present invention, the magnetic component to be charged is a magnetic ring or a magnetic tile.

[0033] According to an embodiment of the present invention, the zero magnetic region of the NS pole of the permanent magnet is ≤0.5mm, preferably ≤0.3mm, for example ≤0.1mm.

[0034] According to an embodiment of the present invention, the extreme width N of the permanent magnet is ≤3mm, preferably ≤2mm, for example N≤1mm.

[0035] According to an embodiment of the present invention, when the pole width N of the permanent magnet is ≤1mm, the zero magnetic region of the NS pole of the permanent magnet is ≤0.05mm, preferably ≤0.02mm.

[0036] According to an embodiment of the present invention, the permanent magnet has different magnetic pole widths or pole numbers M≥1 on one orientation pole face, preferably M≥2.

[0037] Beneficial effects

[0038] (1) The permanent magnet magnetizing device of the present invention includes at least one magnetizing track, which is arc-shaped and is composed of several magnets arranged in a simple structure. The magnetizing magnetic field obtained has good uniformity of field strength, and the field strength inconsistency is ≤±2% (i.e., the fluctuation range of each magnetic field strength is ≤2%). The field strength inconsistency of the magnetic field formed by the conventional magnetizing coil is ≤±5%, usually ≥±3%. Therefore, the magnetizing device of the present invention can provide a magnetizing magnetic field with uniform magnetic pole strength. When magnetizing, the permanent magnet obtained has good uniformity. The zero magnetic region of the NS pole of the permanent magnet is ≤0.5mm, and the pole width is N≤3mm. When N≤1mm, the zero magnetic region of the NS pole is ≤0.05mm. At the same time, it can also obtain permanent magnets with different pole widths or a pole number greater than or equal to 1 on one orientation pole surface.

[0039] (2) The permanent magnet magnetizing device of the present invention has a precision error of ±0.02mm in each magnetic pole width or contour, which is much smaller than the precision error of ±0.1mm of the traditional coil. It has high precision and can more accurately identify the angle for ultra-narrow magnetic poles.

[0040] (3) The permanent magnet magnetizing device of the present invention does not require a magnetizer or other mechanism with power supply during the magnetizing process, and does not require a complex coil structure, which can effectively reduce the cost of magnetizing equipment and save energy. At the same time, the present invention replaces the traditional method of using wire winding to make magnetizing coils, which solves the problems of high difficulty in making magnetizing coils and poor accuracy for magnetic pole widths of less than 1mm. The present invention has a simple structure, is energy-saving and environmentally friendly, safe and reliable in use, and the magnetic rings made have high accuracy per magnetic pole width and small zero magnetic area. It can be used in fields such as high-precision magnetic encoders and can realize the requirement of arbitrary encoding of regional magnetic pole shape.

[0041] (4) The permanent magnet magnetizing device in this invention can magnetize magnetizing parts of any shape, and can provide the greatest possibility for magnetic pole design. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the magnetization device in Embodiment 1 of the present invention;

[0043] Figure 2 This is a schematic diagram of the magnetization device in Embodiment 2 of the present invention;

[0044] Figure 3 These are schematic diagrams of the magnetization devices in Embodiments 3 and 4 of the present invention;

[0045] Figure 4 This is a schematic diagram of the structure of the magnetizing device and the part to be magnetized in Embodiments 1-2 of the present invention.

[0046] Figure 5 This is a schematic diagram of the structure of the magnetizing device and the part to be magnetized in Example 3;

[0047] Figure 6 The graph shows the distribution curve of the magnetic field strength formed by the single-track magnetization device in Test Example 1.

[0048] In the diagram, 1-first track, 2-base, 3-positioning mechanism, 4-positioning ring, 5-positioning rod, 6-magnet, 7-second track, 8-circular arc track, 9-positioning platform, 10-positioning groove, 11-third track, 12-fourth track. Detailed Implementation

[0049] The structure of the present invention will be further described in detail below with reference to specific embodiments. It should be understood that the following embodiments are merely illustrative and explanatory of the present invention and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are covered within the scope of protection intended by the present invention.

[0050] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] The magnets used in the following embodiments are sintered neodymium iron boron permanent magnets, which have high energy product and high consistency, thus providing a uniform and consistent strong magnetic field.

[0053] Example 1

[0054] See Figure 1 As shown, a permanent magnet magnetizing device includes a magnetizing track (first track 1) and a base 2. In this embodiment, the magnetizing track is the first track 1. A positioning mechanism 3 is provided on the base 2. The positioning mechanism 3 includes a positioning ring 4. A positioning rod 5 is provided on the top of the positioning ring 4. The first track 1 is circular and wraps around the outer periphery of the positioning ring 4. The first track 1 and the positioning ring 4 are concentrically arranged.

[0055] In this embodiment, the outer diameter of the positioning ring 4 is R=13mm, the inner diameter of the first track 1 is R=13mm, the diameter of the positioning rod 5 is 20mm, and the height is 66mm.

[0056] The first track 1 is composed of several magnets 6 arranged together. The magnets 6 are connected to the base 2 by adhesive bonding. The magnetic poles of each magnet 6 are different. The magnet 6 is a cuboid structure with a length of 0.8mm, a width of 3mm, and a height of 10mm. The remanence of the magnet 6 is ≥1.3T.

[0057] Among them, the positioning ring 4, the positioning rod 5 and the base 2 are all made of magnetic material.

[0058] Example 2

[0059] See Figure 2 As shown, this embodiment has the same structure as embodiment 1 except for multiple magnetized tracks. In addition to the first track 1 in embodiment 1, it also includes a second track 7. The second track 7 can be a concentric circular track that encloses the first track 1. The height of the magnet 6 of the second track 7 is greater than or equal to the height of the magnet 6 of the first track.

[0060] Alternatively, the second track 7 may be an arc track 8 located inside or outside the first track 1.

[0061] Alternatively, the second track 7 may include a concentric circular track surrounding the second track 2, and an arc track 8 located between the two concentric circular tracks.

[0062] Example 3

[0063] See Figure 3 As shown in the left and middle, a permanent magnet magnetizing device includes a magnetizing track (third track 11) and a base 2. A positioning mechanism 3 is provided on the base 2. The positioning mechanism 3 includes a positioning platform 9. A positioning groove 10 adapted to the structure of the magnetic tile to be magnetized is provided on the outside of the positioning platform 9. The third track 11 is an arc structure covering the outside of the positioning groove 10.

[0064] The positioning groove 10 is arc-shaped with an arc length of 7mm and a central angle of 68°; the third track 11 has an arc length of 14mm and a central angle of 136°.

[0065] Example 4

[0066] See Figure 3 As shown in the right figure, except that the third track 11 has an arc-shaped fourth track 12 at its top, the structure of this embodiment is the same as that of embodiment 3. The arc length of the fourth track 12 is 7mm and the central angle is 68°.

[0067] Example 5

[0068] See Figure 4 The diagram shows the magnetization device of Embodiments 1-2 and the annular part to be magnetized. The annular structure is sleeved on the positioning rod 5 and slid along the positioning rod 5 to the top of the positioning ring 4, where it is surrounded by the magnetization track and magnetized.

[0069] See Figure 5 The diagram shows the magnetization device of Embodiments 3-4 magnetizing the arc-shaped magnetic tile. The magnetic tile is placed in the positioning groove 8 and is surrounded by the magnetization track and magnetized.

[0070] Test Example 1

[0071] The magnetic field strength around the positioning ring 4 in the permanent magnet magnetization device of Example 1 was tested. See [link to example]. Figure 6 As shown, the magnetic field is uniformly distributed along the positioning ring 4 and has an intensity greater than 0.6T.

[0072] Test Example 2

[0073] The permanent magnet was magnetized using the permanent magnet magnetization device of Example 1 and the existing magnetizer KCJ-3590GP2S. For example, the magnetization time of the magnetization device in this example is 1 second; the magnetization time of the existing magnetizer KCJ-3590GP2S is 3 seconds. The magnetization results are shown in Table 1.

[0074] Table 1 Magnetization results of different magnetization devices

[0075]

[0076] The specific embodiments of the present invention have been described above by way of example. However, the scope of protection of the present invention is not limited to the above exemplary embodiments. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A permanent magnet magnetizing device, characterized in that, It consists of a positioning device and at least one magnetized track. The magnetized track is arc-shaped and is composed of several magnets arranged in different directions. The magnets are permanent magnets with a remanence of ≥1T. The arc angle is 30~360°. The positioning device includes a base and a positioning mechanism. The magnetizing track and the positioning mechanism are disposed on the base. The positioning mechanism is used to provide a position for fixing the part to be magnetized. The magnetizing device includes two arc-shaped magnetizing tracks, which are stacked one on top of the other.

2. The permanent magnet magnetizing device according to claim 1, characterized in that, At least one of the magnetizing tracks surrounds the area on the positioning mechanism where the element to be magnetized is placed.

3. The permanent magnet magnetizing device according to claim 1, characterized in that, The positioning device is made of magnetic or non-magnetic material.

4. The permanent magnet magnetizing device according to any one of claims 1-3, characterized in that, When the magnetic component to be charged is an annular shape, the positioning mechanism includes a support platform for supporting the annular shape. A guide rod is also provided on the support platform to provide a channel through which the annular shape passes.

5. The permanent magnet magnetizing device according to any one of claims 1-3, characterized in that, When the magnetic component to be charged is arc-shaped, the positioning mechanism includes a positioning platform, and a positioning groove is provided on the side of the positioning platform opposite to the magnetization track. The positioning groove is used to accommodate the magnetic component to be charged.

6. A method for preparing a permanent magnet magnetizing device according to any one of claims 1-5, comprising the following steps: After magnetizing, the magnet is fixed on the positioning device to form a magnetization track. The magnetization process includes the following steps: magnetizing high remanence sintered NdFeB magnets until the remanence exceeds 1.3T.

7. The application of the permanent magnet magnetizing device according to any one of claims 1-5 or the permanent magnet magnetizing device prepared by the method of claim 6 in magnetization.

8. A method for magnetizing a permanent magnet using the permanent magnet magnetizing device according to any one of claims 1-5 or the permanent magnet magnetizing device prepared by the method according to claim 6, comprising the following steps: placing the part to be magnetized on a positioning device until magnetization is completed to obtain a permanent magnet, wherein the part to be magnetized is a magnetic ring or a magnetic tile.

9. The magnetization method according to claim 8, characterized in that, The zero magnetic region of the NS pole of the permanent magnet is ≤0.5mm, and the pole width N of the permanent magnet is ≤3mm.

10. The magnetization method according to claim 8, characterized in that, When the pole width N of the permanent magnet is ≤1mm, the zero magnetic region of the NS pole of the permanent magnet is ≤0.05mm.

11. The magnetization method according to claim 8, characterized in that, The permanent magnet has different pole widths or a pole number M ≥ 1 on one orientation pole face.

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